sea level
(70in by 80in) is the area of a flat surface, like a gigantic piece of paper. It has no volume ... zero cubic feet ... until you also give it a height or a thickness. "Volume", as in 'cubic feet', is just like "How much water can it hold?". If a tank only has a bottom but no sides, then the answer is "zero".
Zero is zero's name just like one is one's name, two is two's name etc.
Believe it or not, earthworms have zero feet.
Zero's last name is Kiryu.
Zero.
Zero.
Zero
Zero
zero
five hundred six hundred and four point zero zero zero zero zero zero one inched squared cubumatic meteriatric feet
48 inches = 4 feet zero inches
Zero's real name isn't Zero it's maderm Zeroine